I’ve been using fake names since I started getting catcalled by men on the street (when was that? My only memory with a clear date attached: telling some man on the bus that I was eleven when I had turned twelve a month before. Note: by this point, I was familiar enough with the whole situation that I knew a minor lie was a good idea).
So why would it ever cross my mind to put my real name on the web?
(And re catcalling, check out this interesting post about a video game based on it)